8843 and 8854 Photoelectric Smoke Detectors - Siemens Building ...

8843 and 8854 Photoelectric Smoke Detectors
Features
• Advanced Field Cleanable Chamber Design
• Self Diagnostic
• Multi-Color LED for Normal, Trouble or Alarm Indication
• Low-Profile Design
• Easy Twist-In Base Design
• ISO 9001 Certified
• UL Listed, no. S6082
• Made in U.S.A.
Introduction
The Faraday 8843 and 8854 Photoelectric Smoke
Detectors, with its microprocessor controlled selfdiagnostic
circuitry, eliminates cumbersome
sensitivity test equipment. It is the most advanced
detector in its class. This detector employs a simple
twist-in base for ease of maintenance and has a
field cleanable/replaceable labyrinth and bug
screen. This detector is highly immune to false
alarm caused by deceptive phenomena such as
dust or RF. These detectors have a full range of
accessories available, including remote alarm
indicator, remote sensitivity and alarm indicator,
relay and audible base adapters, and a base
adapter that allows use in older Faraday 8914
Series bases.
Description
The 8843/8854 is a two-wire, plug-in type photoelectric
smoke detector which is compatible with
Faraday’s FireWatch-200, FireWatch-400, LifeWatch-
401 and LifeWatch-450 conventional systems.
The 8843/8854 contains an infrared light emitting
diode (LED) and a light sensing photodiode arranged
so that under normal conditions, light from
the LED does not reach the photodiode. When
smoke enters the photo chamber, light emitted
from the IR LED is scattered by the smoke particles
and is received by the photodiode. The electrical
signal produced by the photodiode is compared to
a factory set alarm threshold, and if sufficient to
indicate an alarm, latches the detector alarm. The
8843/ 8854 is reset at the control panel.
Model 8854
The 8843/8854 has self-testing circuitry which tests
the detector for defective operation or contamination
every 7-8 seconds. If a problem is detected, the
multicolor LED indicator will flash amber until the
problem is corrected. The detector flashes green in
normal operation. In the alarm mode, the detector
will flash red every 2-3 seconds, and latch into
alarm, alerting the control panel to the alarm
condition. This microprocessor-controlled self
diagnostic system eliminates the need for external
test meters or other equipment for detector testing
and also alerts users to trouble conditions prior to
periodic system checks.
The detector is field cleanable by twisting the
detector out of the base, unsnapping the chamber
from the outer cover and cleaning or replacing the
removable chamber labyrinth and bug screen.
A fixed 135°F (57°C) thermal sensor is available
with the model 8843. When the thermal sensor is
utilized, an alarm condition will be initiated when
the temperature in the proximity or the sensor
reaches 135°F. At this point the detector locks
into alarm.
9634

The 8854 utilizes the low-profile 8853 surface
mounting base which may be used with a 4 inch
square or octagonal box, as well as a single-gang
electrical box. The 8854 has screw clamp terminals
for easy wiring. The base has an optional concealed
locking device to prevent unauthorized
detector removal.
The 8854 is capable of operating both a remote
lamp and a relay or audible base when used with
LifeWatch-450 control panel, other panels will allow
one accessory per detector. The 8848 Remote Sensitivity
and Alarm indicator duplicates the multicolor
LED of the detector at a remote location to indicate
normal operation (green), trouble or out of sensitivity
(amber), or alarm (red) for detectors located in out of
the way places such as duct detectors, under computer
room floors, or above suspended ceilings. The
8849 is simply a remote red LED to indicate an alarm
condition of a detector.
The 8843 and 8854 and all of the above listed
accessories are UL and ULC listed, and approved
by CSFM and NYMEA, and other local boards
where applicable.
Application Data
The 8843 and 8854 is fully compatible with other
Faraday low voltage detectors and may be intermixed
on the same conventional zone circuit. The
8843 and 8854 are applicable to the 30 foot spacing
(900 sq. ft.) as referred to in the National Fire
Protection Association Standard 72. This detector
spacing, however, is based on ideal conditions and
should be used only as a guide in planning detector
layout. Do not mount detectors close to ventilation
or air conditioning outlets that may move
smoke away from the detector. Exposed joists or
ceiling beams may also effect safe positioning of
smoke detectors. It is mandatory that engineering
judgement be applied regarding detector placement
and spacing.
Detector Cleaning
The detector is field cleanable by twisting the
detector out of the base, unsnapping the chamber
from the outer cover, without affecting sensitive
calibration and cleaning or replacing the removable
chamber labyrinth and bug screen.
Architect and Engineer Specifications
The photoelectric smoke detector shall be a plug-in
unit which mounts to a twist/in base and shall be
UL listed.
The smoke detector shall operate on a two-wire
circuit and shall contain a multicolor LED indicator
indicating the detector is operational by flashing
green, trouble by flashing amber, and alarm by
flashing red. The detector shall be continually self
testing with visual operation indication and not
require additional hardware or contact with the
detector for testing purposes.
The detector shall allow for easy cleaning or
replacement of screens and/or chamber components
without affecting calibration.
The base assembly into which the detector is
installed shall be a twist/in design with screw
clamp terminals. A security lock shall be installed
in those areas where tamper resistant installation is
required as indicated in the drawings.
The detector or group of detectors shall require a
two-wire circuit of #18 AWG thermoplastic fixture
wire enclosed in conduit, or #18 AWG limited
energy shielded cable without conduit, if permitted
by local building codes. All wiring shall be approved
for fire alarm use and in compliance with
national and local codes. When required, the smoke
detector shall contain a 135°F fixed temperature
self restoring heat sensor. Actuation of this device
shall lock the detector alarm circuit.
The detector shall be Faraday Model 8854 or Model
8843 with a 8853 surface mounting base.

Technical Specifications
Current Requirements:
Normal -100 uA peak
Alarm - 40 mA
Voltage Range:
16 - 26.6 Vdc
Operating Temperature:
32-102°F (0-39°C)
Humidity:
93% non-condensing
Shipping Weight:
8843, 8 oz. approx.
8854, 8 oz. approx.
Dimensions
Wiring
Caution:
1. Do not use looped wire under base terminal 5.
Break wire run to provide supervision of connection.
2.When a remote relay is used to control a critical
system function, the relay and it’s associated
detector and optional module(s) must be the only
devices on the initiating circuit.

Ordering Information
Siemens Building Technologies, Inc.
8 Fernwood Road • Florham Park, NJ 07932
Tel: (973) 593-2600 • Fax: (973) 593-6670
Web: www.faradayfirealarms.com
10/05 2M SBT/IG
WARNING
- The information contained in this document is intended only as a summary and
is subject to change without notice. The devices described in this document have specific
instruction sheets which cover various technical, limitation and liability information. Copies
of these instruction sheets and the General Product Warning and Limitations Document,
which also contains important information, are provided with the product and are available
from the Manufacturer. Information contained in these documents should be consulted
before specifying or using the product. For further information or assistance concerning
particular problems contact the Manufacturer.
October 2005 - Supersedes sheet dated 12/03